Sorry I thought this was more of an industrial application.
You have a lab???!!! I am so jealous. They took away my soldering station.....
Phoenix Contact also makes a unit that only does VDC to MA for about half the cost of 'one for all' module. About $200.
Back in the day I would have built it too but today I only play with big wires and voltages so I cannot justify my time on building something I can buy off the shelf for a few hundred dollars.
RSsorry,
RSmike